mx='haPpy birthDay to yOu'
'''
# error 存在语法错误
for x in mx:
    if 'A'<=x<='Z':
        x = x.lower()
    else:
        break
        #continue
print(mx)
'''

new_x = ''
for x in mx:
    if 'A'<=x<='Z':
        new_x += x.lower()
    else:
        new_x += x
print(new_x)